SQL -- Data Definition Language
... Use check clause to ensure that an hourly_wage domain allows only values greater than a specified value. create domain hourly_wage numeric (5,2) constraint value_test check(value > = 4.00) ...
... Use check clause to ensure that an hourly_wage domain allows only values greater than a specified value. create domain hourly_wage numeric (5,2) constraint value_test check(value > = 4.00) ...
Chapter 1: Introduction
... between the low-level data stored in the database and the application programs and queries submitted to the system. The storage manager is responsible to the following tasks: ...
... between the low-level data stored in the database and the application programs and queries submitted to the system. The storage manager is responsible to the following tasks: ...
Guide to Using SQL: Synonyms and the Rename Statement
... and types) to the previously referenced table, or at least contains a superset of columns of the original table. An incompatible change would be detected at runtime if a routine or trigger, for instance, referenced a column that no longer existed, or had a different (and incompatible) data type. The ...
... and types) to the previously referenced table, or at least contains a superset of columns of the original table. An incompatible change would be detected at runtime if a routine or trigger, for instance, referenced a column that no longer existed, or had a different (and incompatible) data type. The ...
Romancing Your Data: The Getting-to-Know-You Phase
... broadly for ‘anyone who uses an Oracle database to solve business problems.’ An analyst’s main interest in the database is to solve business problems that have data-driven solutions. An analyst may be lucky enough to receive a mapping that includes tables, variable names, relationships, and definiti ...
... broadly for ‘anyone who uses an Oracle database to solve business problems.’ An analyst’s main interest in the database is to solve business problems that have data-driven solutions. An analyst may be lucky enough to receive a mapping that includes tables, variable names, relationships, and definiti ...
6_RMD
... (iii) In the referencing relation, set the row value which references a deleted row of the referenced relation to some ‘default’ row value of the referenced relation. Example: In figure 3.4 set the studid column to the sid of some (existing) ‘default’ student for every ‘Enrolled’ row that refers to ...
... (iii) In the referencing relation, set the row value which references a deleted row of the referenced relation to some ‘default’ row value of the referenced relation. Example: In figure 3.4 set the studid column to the sid of some (existing) ‘default’ student for every ‘Enrolled’ row that refers to ...
Set Predicates in SQL: Enabling Set
... atomic values. Only a few articles deal with special non-equijoins in conjunction with aggregate functions, and pointer-based joins. An area where more complex join predicates occur is that of spatial database systems. Here, special algorithms to supp ort spatial joins have been developed. Despite t ...
... atomic values. Only a few articles deal with special non-equijoins in conjunction with aggregate functions, and pointer-based joins. An area where more complex join predicates occur is that of spatial database systems. Here, special algorithms to supp ort spatial joins have been developed. Despite t ...
Database Users
... Two-tier architecture: E.g. client programs using ODBC/JDBC to communicate with a database Three-tier architecture: E.g. web-based applications, and applications built using “middleware” ...
... Two-tier architecture: E.g. client programs using ODBC/JDBC to communicate with a database Three-tier architecture: E.g. web-based applications, and applications built using “middleware” ...
SQL Server 2005 Security Best Practices
... When choosing service accounts, consider the principle of least privilege. The service account should have exactly the privileges that it needs to do its job and no more privileges. You also need to consider account isolation; the service accounts should not only be different from one another, they ...
... When choosing service accounts, consider the principle of least privilege. The service account should have exactly the privileges that it needs to do its job and no more privileges. You also need to consider account isolation; the service accounts should not only be different from one another, they ...
Oracle - University of St. Thomas
... Allows Oracle to read and write (dynamic) data from and to selected non-relational databases Two varieties - procedural and transparent ...
... Allows Oracle to read and write (dynamic) data from and to selected non-relational databases Two varieties - procedural and transparent ...
2.2. Hardware Architecture, the Trend to Shared-Nothing
... architecture is based on a shared-nothing hardware design [STON86] in which processors communicate with one another only by sending messages via an interconnection network. In such systems, tuples of each relation in the database are partitioned (declustered) across disk storage units3 attached dire ...
... architecture is based on a shared-nothing hardware design [STON86] in which processors communicate with one another only by sending messages via an interconnection network. In such systems, tuples of each relation in the database are partitioned (declustered) across disk storage units3 attached dire ...
IT344TestBankandMultipleChoiceQuestions (1)
... answers for some relatively small n. Give a good way of evaluating the query a. when the join is on a foreign key of r referencing s. b. when the join is not on a foreign key. 19.24 Given two SQL queries of the for select A1, . . . , An from R1, . . . , Rn where P1 groupby G1 and select B1, . . . , ...
... answers for some relatively small n. Give a good way of evaluating the query a. when the join is on a foreign key of r referencing s. b. when the join is not on a foreign key. 19.24 Given two SQL queries of the for select A1, . . . , An from R1, . . . , Rn where P1 groupby G1 and select B1, . . . , ...
Application of NoSQL Database in Web Crawling
... indexes. With the powerful query language syntax similar to the object-oriented language, MongoDB can achieve the most function of single-table query in relational database. It also supports atomic in-place update and two replication mechanisms of Master/Slave and replica set [9] [11]. MongoDB both ...
... indexes. With the powerful query language syntax similar to the object-oriented language, MongoDB can achieve the most function of single-table query in relational database. It also supports atomic in-place update and two replication mechanisms of Master/Slave and replica set [9] [11]. MongoDB both ...
DATASPREAD: Unifying Databases and Spreadsheets
... where columns generally correspond to attributes and rows to tuples. Here, adding an attribute, which is essentially a change to schema, is as natural and convenient as adding a tuple. This is due to the fact that spreadsheets do not treat columns and rows differently when we consider the operations ...
... where columns generally correspond to attributes and rows to tuples. Here, adding an attribute, which is essentially a change to schema, is as natural and convenient as adding a tuple. This is due to the fact that spreadsheets do not treat columns and rows differently when we consider the operations ...
VIQING: Visual Interactive QueryING
... – Can incrementally build and refine queries – Query manipulations on custom graphical representation of data, which is easier to understand than text – Don’t need to know SQL syntax -- just drag and drop (direct-manipulation) ...
... – Can incrementally build and refine queries – Query manipulations on custom graphical representation of data, which is easier to understand than text – Don’t need to know SQL syntax -- just drag and drop (direct-manipulation) ...
Week 1, Lecture 1
... word document that one of the authors used as a handout for the Database B&R class at Regis University One student remarked “you could turn this into a book...” Author sent the document to Apress, the editor remarked “what you have here is a cookbook or recipe format type book...” ...
... word document that one of the authors used as a handout for the Database B&R class at Regis University One student remarked “you could turn this into a book...” Author sent the document to Apress, the editor remarked “what you have here is a cookbook or recipe format type book...” ...
DATASPREAD: Unifying Databases and Spreadsheets
... where columns generally correspond to attributes and rows to tuples. Here, adding an attribute, which is essentially a change to schema, is as natural and convenient as adding a tuple. This is due to the fact that spreadsheets do not treat columns and rows differently when we consider the operations ...
... where columns generally correspond to attributes and rows to tuples. Here, adding an attribute, which is essentially a change to schema, is as natural and convenient as adding a tuple. This is due to the fact that spreadsheets do not treat columns and rows differently when we consider the operations ...
Managing Objects with Data Dictionary Views
... DBA_OBJECTS contains information on all objects that are owned by all users. For views that are prefixed with ALL or DBA, there is usually an additional column in the view named OWNER to identify who owns the object. There is also a set of views that is prefixed with v$. These views are dynamic in n ...
... DBA_OBJECTS contains information on all objects that are owned by all users. For views that are prefixed with ALL or DBA, there is usually an additional column in the view named OWNER to identify who owns the object. There is also a set of views that is prefixed with v$. These views are dynamic in n ...
Scalable SQL and NoSQL Data Stores
... provide better horizontal scaling for OLTP, when compared to traditional RDBMSs. After examining the NoSQL systems, we will look at these SQL systems and compare the strengths of the approaches. The SQL systems strive to provide horizontal scalability without abandoning SQL and ACID transactions. We ...
... provide better horizontal scaling for OLTP, when compared to traditional RDBMSs. After examining the NoSQL systems, we will look at these SQL systems and compare the strengths of the approaches. The SQL systems strive to provide horizontal scalability without abandoning SQL and ACID transactions. We ...
Triggers PowerPoint
... Understanding How an INSERT Trigger Works • During a transaction, the inserted data will be available in an in-memory structure called inserted. – Within the trigger action, you have the ability to retrieve and manipulate values inside the inserted table. • The inserted table will have a copy of al ...
... Understanding How an INSERT Trigger Works • During a transaction, the inserted data will be available in an in-memory structure called inserted. – Within the trigger action, you have the ability to retrieve and manipulate values inside the inserted table. • The inserted table will have a copy of al ...
Notes 5. Working with Multiple Tables
... associated with the event that caused the postback and executes its code. The submitButton_Click() method Finally, we’ll look at the submitButton_Click() method. This is the method that actually builds and executes the queries. What’s important here is that there are two queries, not one. The first ...
... associated with the event that caused the postback and executes its code. The submitButton_Click() method Finally, we’ll look at the submitButton_Click() method. This is the method that actually builds and executes the queries. What’s important here is that there are two queries, not one. The first ...